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Diffstat (limited to 'third_party/aom/aom_util/endian_inl.h')
-rw-r--r-- | third_party/aom/aom_util/endian_inl.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/third_party/aom/aom_util/endian_inl.h b/third_party/aom/aom_util/endian_inl.h new file mode 100644 index 0000000000..b69102a7f5 --- /dev/null +++ b/third_party/aom/aom_util/endian_inl.h @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ +// +// Endian related functions. + +#ifndef AOM_AOM_UTIL_ENDIAN_INL_H_ +#define AOM_AOM_UTIL_ENDIAN_INL_H_ + +#include <stdlib.h> + +#include "config/aom_config.h" + +#include "aom/aom_integer.h" + +#if defined(__GNUC__) +#define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__) +#define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min))) +#else +#define LOCAL_GCC_VERSION 0 +#define LOCAL_GCC_PREREQ(maj, min) 0 +#endif + +// handle clang compatibility +#ifndef __has_builtin +#define __has_builtin(x) 0 +#endif + +// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__) +#if !defined(WORDS_BIGENDIAN) && \ + (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \ + (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))) +#define WORDS_BIGENDIAN +#endif + +#if defined(WORDS_BIGENDIAN) +#define HToLE32 BSwap32 +#define HToLE16 BSwap16 +#define HToBE64(x) (x) +#define HToBE32(x) (x) +#else +#define HToLE32(x) (x) +#define HToLE16(x) (x) +#define HToBE64(X) BSwap64(X) +#define HToBE32(X) BSwap32(X) +#endif + +#if LOCAL_GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16) +#define HAVE_BUILTIN_BSWAP16 +#endif + +#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32) +#define HAVE_BUILTIN_BSWAP32 +#endif + +#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64) +#define HAVE_BUILTIN_BSWAP64 +#endif + +static INLINE uint16_t BSwap16(uint16_t x) { +#if defined(HAVE_BUILTIN_BSWAP16) + return __builtin_bswap16(x); +#elif defined(_MSC_VER) + return _byteswap_ushort(x); +#else + // gcc will recognize a 'rorw $8, ...' here: + return (x >> 8) | ((x & 0xff) << 8); +#endif // HAVE_BUILTIN_BSWAP16 +} + +static INLINE uint32_t BSwap32(uint32_t x) { +#if defined(HAVE_BUILTIN_BSWAP32) + return __builtin_bswap32(x); +#elif defined(__i386__) || defined(__x86_64__) + uint32_t swapped_bytes; + __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x)); + return swapped_bytes; +#elif defined(_MSC_VER) + return (uint32_t)_byteswap_ulong(x); +#else + return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24); +#endif // HAVE_BUILTIN_BSWAP32 +} + +static INLINE uint64_t BSwap64(uint64_t x) { +#if defined(HAVE_BUILTIN_BSWAP64) + return __builtin_bswap64(x); +#elif defined(__x86_64__) + uint64_t swapped_bytes; + __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x)); + return swapped_bytes; +#elif defined(_MSC_VER) + return (uint64_t)_byteswap_uint64(x); +#else // generic code for swapping 64-bit values (suggested by bdb@) + x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32); + x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16); + x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8); + return x; +#endif // HAVE_BUILTIN_BSWAP64 +} + +#endif // AOM_AOM_UTIL_ENDIAN_INL_H_ |